<ul>
    <volist name="$menu" id="nav">
        <li class="drop">
            <a href="{$nav.href}">{$nav.name}</a>
            <if condition="$nav['children']">
                <ul class="menu">
                    <volist name="nav['children']" id="item">
                        <li><a href="{$item.href}">{$item.name}</a></li>
                    </volist>
                </ul>
            </if>
        </li>
    </volist>
</ul>